Accelerators, beam handling and targets
A high power liquid 3,4He target system for electron scattering experiments

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Abstract

A cryogenic target system for liquid 3He and 4He operating at temperatures between 1.2 and 2.2 K that can take one watt of electron beam power is discussed. For 4He in the superfluid state an effective target thickness nearly independent of beam dissipation was observed. In the case of 3He the effective target thickness changed only modestly and can be corrected for reliably. The resolution attainable in the 3He(e, e′p)2H coincidence reaction with this cryotarget and the electron and hadron spectrometers is shown to be 600 keV.

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